What is the total number of valence electrons in a calcium atom in the ground state?(1) 8 (3) 18
(2) 2 (4) 20

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Answer 1

Answer: In its ground state Calcium has a 2 valence electrons.

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CO2 + H2 -> CO + H2O What is being oxidized?

All of the following methods would increase the solubility of a solid solute, except for

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may i please have a(n) answer choices please because it would be a lot better if it was like that and then ill answer it

Which of the following chemical reactions is an oxidation-reduction reaction? CuSO4 + BaCl2 yields BaSO4 + CuCl2 Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3 N2 + 3H2 yields 2NH3 K2SO4 + BaCl2 yields BaSO4 + 2KCl

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Answer : The correct option is, $N_2+3H_2\rightarrow 2NH_3$

Explanation :

(1) $CuSO_4+BaCl_2\rightarrow BaSO_4+CuCl_2$

(2) $Pb(NO_3)_2+2NaCl\rightarrow PbCl_2+2NaNO_3$

(3) $K_2SO_4+BaCl_2\rightarrow BaSO_4+2KCl$

The reactions 1, 2, and 3 are the example of double-displacement reaction in which the cation and anion of the two reactants exchange their places to give two new compounds.

(4) $N_2+3H_2\rightarrow 2NH_3$

This reaction is an example of oxidation-reduction reaction.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases.

In this reaction the oxidation state of nitrogen and hydrogen is (0) and the oxidation state of nitrogen and hydrogen in $NH_3$ are, (-3) and (+1). So, from this we conclude that the nitrogen shows reduction reaction and hydrogen shows oxidation reaction.

Hence, the correct option is, $N_2+3H_2\rightarrow 2NH_3$

The answer is N2 + 3H2 yields 2NH3. The oxidation-reduction reaction means that there is electrons transfer during the reaction which means that the valence changed.

Doing science, and having a bit of trouble.
please help
thank you so much!

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Each column is also called a group. The elements in each group have the same number of electrons in the outer orbital. As you keep counting the columns, you'll know how many electrons are in the outer shell.

Which net change occurs in a nuclear fusionreaction?
(1) Ionic bonds are broken.
(2) Ionic bonds are formed.
(3) Energy is converted to mass.
(4) Mass is converted to energy.

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The correct answer would be option 4. Fusion reaction is a type of nuclear reaction where two or more nuclei combine or collide to form an element with a higher atomic number. This happens when the collision is in a very high speed. In this process, some of the matter of the fusing nuclei is converted to energy.

What color is potassium iodide and lead nitrate ? (is) because it is mixed and it is all one as a compound or a chemical formula or equation .

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Lead nitrate and potassium iodide, which are the reactants, are powders that react to form a yellow-colored lead iodide and a colorless potassium nitrate!

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b. Oxygen, fuel, primer.
c. Oxygen, fuel, oxygen enriched environment.
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